Walter scott phelps



2 Sheets-Sheet 1.

(No Model.)

W. S. PHELPS. VALVE FOR STEAM ENGINES.

No. 401,853. Patented Apr. 23, 1889.

5 BY M WITNESSES: W/M; k

ATTORNEYS.

gmphev. Washi 2. Sheets-Sheet 2.

(NqMod eL) W S PHELPS ALVE FORSTEAM ENGINES.

No. 401,853. Patented Apr. 23. 1889 INVENTOR. 7544' mm ATTORNEYS.

UNITED STATES PATENT OFFICE.

W'ALTER SCOTT PHELPS, OF ST. CATALINA, GUANTANAMO, CUBA.

VALVE FOR STEAM ENGINES.

SIPEGIFICA'IION forming part of Letters IPatent No. 401,853, dated April 23, 1889.

Application filed September 21, 1888. Serial 1%. 285,989. (No model.)

To all whom it may concern:

Be it known that I,WALTER SCOTT PHELPS, of St. Catalina, Guantanamo, Cuba, have in vented a new and Improved Valve for Steam Engines, of which the following is a full, clear, and exactdescription.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of my new and improved steam-valve and valve-casing. Fig. 2 is a longitudinal sectional elevation of the same. Fig. 3 is a transverse sectional elevation taken on the line m so of Fig. 2. Fig. lis an end view of the valve without the casing. Fig. 5 is a front elevation of the center ring. Fig. 6 is an end view of one of the heads of the valve, and Fig. 7 is a front elevation of the compression and vacuum relief-valve having two seats.

The object of this invention is to avoid excessive compression in the steam -cylinder, and also to destroy the strong suction caused by vacuum created in the Valve-chamber; and to this end myinvention consists, principally, of a relief-valve held seated by a spring, but exposed at the opposite side to the pressure of the steam, so that in case of excessive compression, suction, or vacuum, the engine being in motion and steam shut off, the valve will lift, and steam or hot vapor and gases will enter and destroy compression and vacuum by way of the apertures under the valve leading to the exhaust, as well as opening directly into the steam-pipe through the piston valve, thereby giving free openings from the steampipe direct to the atmosphere through the exllaustpipes.

A represents the valve-casi11g,a11d B the valve attached to the rod 0. The casing A is formed with numerous steam-ports, a a. The valve B is composed of two heads or pistons, 13 B. These are duplicates of each other, and are each formed of a circular plate, I), with the rim 0 parallel with the rod 0 and vertical flange 0. Through the rim 0 are formed the openings 0 Through the said plate I) are formed the openings 0". Around the outer surface of the rim 0 is placed a ring, (Z, formed with a median. circumferential flange, cl, and

in said rings are formed openings 0 to correspond with the openings 0 in the rim 0. The flange cl isrecessed at intervals, as shown at d. Upon the ring cl each side of the circumferential flange d are placed double packing-rings f f Within the rim 0 is fitted the relief valve g, which is held to its two seats by a coiled spring, g held in contact with the valve by the large circular plate 71, on the rod 0, and which holds the packing-rings and the ring d firmly against the flange 0 of the body 1). Through the plate h are formed the passages h.

The two heads 13 B are held on the shaft 0 by the shoulder m and nut m, and the adj acent faces of the plates 1) b are formed with bosses n, which space said plates one from the other, as shown in Fig. 2.

In case the piston when in operation causes a compression upon the relief-valve g with the vacuuni or suction at either end of the valve, which exceeds the pressure of the spring 6, the valve Q will lift and destroy all compression inthecylinders' or vacuum in the pipes, whereupon the spring will reseat the valve until operated upon again from the same forces. In this manner excessive suction and compression is avoided, and a waste of steam is obviated.

The relief-valve g has two seats-one covering the holes 0, leading to the exhaust, the other (a seat upon its outer rim) covering the passage leading into the steam pipe and chest. The unseatin g of this valve will open all con necting passages through the piston-head,in eluding passages 0 c, and (1* from the throttle to the escape-pipe or atmosphere simultaneously.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. A piston-valve for stealnengines, having passages through it from end to end and formed with two valve-seats, in combination with a valve held to said two seats bya spring, substantially as and for the purposes set forth.

2. A piston-valve for steam-engines, having passages c h, in combination with the interposed valve g, held by spring g, substantially as described.

Apiston-valve for steam-engines, having ISO 5. In a va1ve,uhe ring (1, formed With thepas IO sag s c flange (Z', and recesses d substantially as described.

\VALTER SCOTT PHELPS.

\Vitnesses:

ANTONIO NAVARRO, ERNESTO VILLASANA. 

